Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
  • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
  • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
  • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/02—Polyureas
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes

Definitions

• the invention relates to hydrolysis-stable, aqueous coating compositions, to a process for their preparation and to use as soft-feel coating.
• PU dispersions Polyurethane-polyurea dispersions
• aqueous formulations of PU dispersions are known in the art.
• An important field of application of aqueous preparations of ionically modified PU dispersions is in the field of coating plastic parts.
• plastic parts are usually painted to protect the plastic from external influences, such as sunlight, chemical, thermal and mechanical stress, to achieve certain hues and color effects, to cover defects of the plastic surface or to the plastic surface a pleasant grip To give (haptic).
• softfeel effect in the sense of the present invention denotes a special feel (feel) of the painted surface; This feel can be described in terms of velvety, soft, rubbery, warm.
• aqueous soft-feel coatings based on polyurethane chemistry have become established in recent years, as disclosed by way of example in DE-A 44 06 159.
• these coatings also give coatings with good resistance and protective effect for the plastic substrate.
• these lacquers and coatings often have inadequate resistance to hydrolysis.
• the object of the present invention was therefore to provide coating compositions which, in addition to the o.g. mechanical and haptic properties, compared to coatings of the prior art, lead to significantly more hydrolysis-stable coatings.
• plastic coating compositions with the desired haptic soft feel properties consist to a certain extent of PU dispersions which have no appreciable amounts of hydroxy-functional groups.
• DE-A 101 22 444 describes hydrolystable, ionically and / or nonionically hydrophilicized polyurethane-polyurea- (PUR) -dispersions based on polycarbonate polyols and polytetra methylene glycol polyols.
• PUR polyurethane-polyurea-
• the dispersions lead to hydrolysis-resistant, kink-resistant and scratch-resistant coatings on a wide variety of substrates in one-component coating compositions. However, an application of these dispersions as softfeel paints is not described.
• aqueous two-component (2K) coating compositions which contain both non-functional polyurethane polymers based on polycarbonate polyols and polytetramethylene glycol polyols and hydrophilic, hydroxyl group-containing polyurethane polymers exhibit excellent hydrolytic stability and simultaneously the desired haptic properties ,
• the present invention therefore relates to aqueous coating compositions containing
• the non-functional PUR polymers (I) and the hydroxy- and / or amino-functional crosslinkable PUR polymers (H) contain compounds selected from the groups L1) to 1.6) or ⁇ .l) to II.6) :,
• polymeric polyols having a number average molecular weight of from 200 to 8000 g / mol
• Suitable polyisocyanates of component 1.1) and Hl) are the aromatic, araliphatic, aliphatic or cycloaliphatic polyisocyanates known to the person skilled in the art having an NCO functionality of preferably> 2, which also comprises iminooxadiazinedione, isocyanurate, Uretdione, urethane, allophanate, biuret, urea, Oxadiazintrion, oxazolidinone, acyl urea and / or carbodiimide structures may have. These can be used individually or in any mixtures with one another.
• polyisocyanates examples include butylene diisocyanate, hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 2,2,4 and / or 2,4,4-trimethylhexamethylene diisocyanate, the isomeric bis (4,4'-isocyanatocyclohexyl) methanes or their mixtures of any isomers content, isocyanatomethyl-l, 8-octane diisocyanate, 1,4-cyclohexylene diisocyanate, 1,4-phenylene diisocyanate, 2,4- and / or 2,6-toluene diisocyanate, 1,5-naphthylene diisocyanate, 2,4'- or 4 , 4'-diphenylmethanediisocyanate, triphenylmethane-4,4 ', 4 "-triisocyanat or derivatives based on the above-mentioned diisocyanates
• non-modified polyisocyanate having more than 2 NCO groups per molecule see e.g. 4-Isocyanatomethyl-l, 8-octane diisocyanate (nonane triisocyanate) called.
• hexamethylene diisocyanate isophorone diisocyanate, the isomeric bis (4,4'-isocyanatocyclohexyl) methanes and mixtures thereof.
• the PUR polymers (I) contain as component 1.2) a mixture of polycarbonate polyols and polytetramethylene glycol polyols.
• the proportion of polycarbonate in the mixture is between 20 and 80 wt.%
• the proportion of polytetramethylene glycol polyols is between 80 and 20 wt.%.
• Preference is given to a proportion of 30 to 75 wt .-% of polytetramethylene glycol polyols and a content of 25 to 70 wt .-% of polycarbonate polyols.
• polys mentioned under 1.2 have an OH functionality of at least 1.8 to 4. Preference is given to using polyols in a mean molecular weight range of from 200 to 8000 with an OH functionality of from 2 to 3. Particular preference is given to polyols having average molecular weight ranges from 200 to 3000.
• Suitable polytetramethylene glycol polyols are polytetramethylene glycol polyethers which can be prepared, for example, by polymerization of tetrahydrofuran by cationic ring opening.
• Hydroxyl-containing polycarbonate polyols corresponding to the definition of component 1.2) are obtained by reaction of carbonic acid derivatives, e.g. Diphenyl carbonate, dimethyl carbonate or phosgene with diols available.
• carbonic acid derivatives e.g. Diphenyl carbonate, dimethyl carbonate or phosgene
• diols come e.g. Ethylene glycol, 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, 1,12-dodecanediol, neopentyl glycol, 1,4-bis-hydroxymethylcyclo hexane, 2-methyl-l, 3-propanediol, 2,2,4-trimethylpentanediol-l, 3, dipropylene glycol, polypropylene glycols, dibutylene glycol, polybutylene glycols, bisphenol A, tetrabromobisphenol A but also lactone-modified diols in question.
• Ethylene glycol 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, 1,6-hexanediol, 1,8-oct
• the Diolkompomponente contains 40 to 100 wt .-% of hexanediol, preferably 1,6-hexanediol and / or hexanediol derivatives, particularly preferably those derivatives which in addition to terminal OH groups ether or ester groups, such as products obtained by reaction of 1 mole of hexanediol with at least 1 mole, preferably 1 to 2 moles of caprolactone or by etherification of hexanediol with itself to di- or trihexylene glycol were obtained.
• the preparation of such derivatives is e.g. known from DE-A 15 70 540.
• the polyether-polycarbonate diols described in DE-A 37 17 060 can also be used.
• the hydroxylpolycarbonates are preferably linear, but may optionally be branched by the incorporation of polyfunctional components, in particular low molecular weight polyols.
• polyfunctional components in particular low molecular weight polyols.
• glycerol, trimethylolpropane, hexanetriol-1,2,6, butanetriol-1,2,4, trimethylolpropane, pentaerythritol, quinitol, mannitol and sorbitol or methyl glycoside and 1,3,4,6-dianhydrohexitols are suitable for this purpose.
• Polyester polyols which can be used as compounds ⁇ .2) preferably have a molecular weight Mn of from 400 to 6000, particularly preferably from 600 to 3000. Their hydroxyl number is generally 22 to 400, preferably 50 to 200 and particularly preferably 80 to 160 mg / KOH / g, and have an OH functionality of 1.5 to 6, preferably from 1.8 to 3 and particularly preferably from 2 on.
• suitable diols are ethylene glycol, butylene glycol, diethylene glycol, triethylene glycol, polyalkylene glycols such as polyethylene glycol, furthermore propanediol, butanediol (1,4), hexanediol (1,6), neopentyl glycol or Hydroxypivalinklareeneopenthylglykolester, wherein the latter three compounds are vor ⁇ assigned to.
• suitable polyols to be used here are trimethylolpropane, glycerol, erythritol, pentaerythritol, trimethylolbenzene or trishydroxyethyl isocyanurate.
• Suitable diGarboxylic acids are, for example, phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, cyclohexanedicarboxylic acid, adipic acid, azelaic acid, sebacic acid, glutaric acid, tetrachlorophthalic acid, maleic acid, fumaric acid, itaconic acid, malonic acid, suberic acid, 2-methylsuccinic acid, 3,3- Diethylglutaric acid, 2,2-dimethyl-succinic acid.
• Anhydrides of these acids are also useful, as far as they exist.
• anhydrides are encompassed by the term "acid”.
• Monocarboxylic acids such as benzoic acid and hexanecarboxylic acid can also be used, provided that the average functionality of the polyol is higher than 2.
• Saturated aliphatic or aromatic acids are preferred, such as adipic acid or isophthalic acid.
• trimellitic acid may be mentioned here.
• Hydroxycarboxylic acids which can be used as reactants in the preparation of a hydroxyl-terminated polyester polyol include hydroxycaproic acid, hydroxybutyric acid, hydroxydecanoic acid, hydroxystearic acid, and the like.
• Useful lac- tones are u. a. Caprolactone, butyrolactone and the like.
• Compounds of component II.2) may at least partially contain primary or secondary amino groups as NCO-reactive groups.
• Suitable compounds H2) are also hydroxyl-containing polycarbonates having a molecular weight Mn of 400 to 6000, preferably 600 to 3000, which are obtainable, for example, by reaction of carbonic acid derivatives, for example diphenyl carbonate, dimethyl carbonate or phosgene with polyols, preferably diols.
• diols examples include ethylene glycol, 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, neopentyl glycol, 1,4-bishydroxymethylcyclohexane, 2 Methyl-l, 3-propanediol, 2,2,4-Trimethylpentandiol-l, 3, dipropylene glycol, polypropylene glycols, dibutylene glycol, polybutylene glycols, bisphenol A, tetrabromo bisphenol A but also lactone-modified diols in question.
• the diol component preferably contains 40 to 100% by weight of hexanediol, preferably 1,6-hexanediol and / or hexanediol derivatives, preferably those which have ether or ester groups in addition to terminal OH groups, for example products which are obtained by reacting 1 mole of hexanediol with at least 1 mole, preferably 1 to 2 moles of caprolactone or by etherification of hexanediol with itself to di- or trihexylene glycol were obtained.
• Polyether-polycarbonate diols can also be used.
• the hydroxyl polycarbonates should be substantially linear.
• glycerol trimethylolpropane, hexanetriol-1,2,6, butanetriol-1,2,4, trimethylolpropane, pentaerythritol, quinitol, mannitol, sorbitol, methyl glycoside or 1,3,4,6-dianhydrohexitols are suitable for this purpose.
• Suitable polyether polyols corresponding to the definition of the compounds ⁇ .2) are the polytetramethylene glycol polyethers known per se in polyurethane chemistry, e.g. can be prepared by polymerization of tetrahydrofuran by cationic Ringöff ⁇ ung.
• suitable polyether polyols are polyethers, e.g. the polyols prepared from starter molecules using styrene oxide, ethylene oxide, propylene oxide, butylene oxides or epichlorohydrins, in particular of propylene oxide.
• polyester polyols and / or polycarbonate polyols are preferred.
• the low molecular weight polyols 1.3) or H3) used to build up the polyurethane resins generally cause stiffening and / or branching of the polymer chain.
• the molecular weight is preferably between 62 and 200.
• Suitable polyols may include aliphatic, alicyclic or aromatic groups. Mentioned here are, for example, the low molecular weight polyols having up to about 20 carbon atoms per molecule, such as.
• ethylene glycol diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,3-butylene glycol, cyclohexanediol, 1,4-cyclohexanedimethanol, 1,6-hexanediol, hydroquinone hydroxyethyl ether, bisphenol A (2,2-bis (4-hydroxyphenyl) propane), hydrogenated bisphenol A (2,2-bis (4-hydroxycyclohexyl) propane) and mixtures thereof, and trimethylolpropane, glycerol or pentaerythritol.
• ester diols such as e.g.
• ⁇ -Hydroxybutyl- ⁇ -hydroxy-caproic acid esters ⁇ -hydroxyhexyl- ⁇ -hydroxybutyric acid esters, adipic acid ( ⁇ -hydroxyethyl) esters or terephthalic acid bis ( ⁇ -hydroxyethyl) esters can be used.
• Di- or polyamines as well as hydrazides can also be used as 1.3) or ⁇ .3), e.g. Ethylenediamine, 1,2- and 1,3-diaminopropane, 1,4-diaminobutane, 1,6-diaminohexane, isophorone diamine, isomer mixture of 2,2,4- and 2,4,4-trimethylhexamethylenediamine, 2-methylpentane methylenediamine, diethylenetriamine, 1,3- and 1,4-xylylenediamine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethyl-1,3,4,4-diaminodicyclohexylmethane, dimethylethylenediamine, hydrazine or adipic dihydrazide ,
• H.3 are in principle also compounds which contain active hydrogen with respect to NCO groups of different reactivity, such as compounds which in addition to a primary amino group and secondary amino groups, or in addition to an amino group (primary or sekvmdär) also have OH groups.
• Examples of these are primary / secondary amines, such as 3-amino-1-methylaminopropane, 3-amino-1-ethylaminopropane, 3-amino-1-cyclohexylaminopropane, 3-amino-1-methylaminobutane, furthermore alkanolamines, such as N-aminoethyl- ethanolamine, ethanolamine, 3-aminopropanol, neopentanolamine and more preferably diethanolamine.
• these are used as chain extenders and in the case of use for the preparation of the PU dispersion (IT) as chain termination.
• the polyurethane resin may also optionally contain building blocks 1.4) or H4), which are respectively located at the chain ends and terminate them.
• building blocks are derived, on the one hand, from monofunctional compounds reactive with NCO groups, such as monoamines, in particular mono-secondary amines or monoalcohols.
• Examples which may be mentioned here are: ethanol, n-butanol, ethylene glycol monobutyl ether, 2-ethylhexanol, 1-octanol, 1-dodecanol, 1-hexadecanol, methylamine, ethylamine, propylamine, butylamine, octylamine, laurylamine, stearylamine, isononyloxypropylamine, dimethylamine , Diethylamine, dipropylamine, dibutylamine, N-methylaminopropylamine, diethyl (methyl) aminopropylamine, morpholine, piperidine, or suitable substituted derivatives thereof, amide amines from diprimary amines and monocarboxylic acids, monodime of diprimary amines, primary / tertiary amines, such as N, N-dimethylaminopropylamine and the like.
• Preferred isocyanate-reactive groups are hydroxyl or amino groups.
• Suitable ionically or potentially ionically hydrophilic compounds according to the definition of component 1.5) or H5) are, for example, mono- and dihydroxycarboxylic acids, mono- and diaminocarboxylic acids, mono- and dihydroxysulfonic acids, mono- and diaminosulfonic acids and mono- and dihydroxyphosphonic acids or mono- and diaminophosphonic acids and their salts, such as dimethylolpropionic acid, dimethylolbutyric acid, hydroxypivalic acid, N- (2-aminoethyl) - ⁇ -alanine, 2- (2-aminoethylamino) -ethanesulfonic acid, ethylenediamine-propyl- or -butylsulfonic acid, 1,2- or 1,3-propylenediamine- ⁇ -ethylsulfonic acid, malic acid, citric acid, glycolic acid, lactic acid, glycine, alanine, taurine, lysine,
• Preferred ionic or potential ionic compounds 1.5) are those which have carboxy or carboxylate and / or sulfonate groups and / or ammonium groups.
• Particularly preferred ionic compounds 1.5) are those which contain carboxyl and / or sulfonate groups as ionic or potentially ionic groups, such as the salts of N- (2-aminoethyl) - ⁇ -alanine, the 2- (2-amino-ethylamino) ) ethanesulfonic acid or the addition product of IPDI and acrylic acid (EP-A 0 916 647, Example 1) and the dimethylolpropionic acid.
• Preferred ionic or potential ionic compounds II.5) are those which have carboxy and / or carboxylate groups.
• Particularly preferred ionic compounds ⁇ .5) are dihydroxycarboxylic acids, very particular preference is given to ⁇ , ⁇ -dimethylolalkanoic acids, such as 2,2-dimethylolacetic acid, 2,2-dimethylolpropionic acid, 2,2-dimethylolbutyric acid, 2,2-dimethylolpentanoic acid or dihydroxysuccinic acid.
• Suitable nonionically hydrophilicizing compounds are e.g. Polyoxyalkylene ethers containing at least one hydroxy or amino group. These polyethers contain from 30% to 100% by weight of building blocks derived from ethylene oxide.
• Nonionically hydrophilizing compounds are, for example, monohydric polyalkylene oxide polyether alcohols having a statistical average of 5 to 70, preferably 7 to 55 ethylene oxide units per molecule, as are obtainable in a conventional manner by alkoxylation of suitable starter molecules (eg in Ullmanns Encyclopadie der ischen Chemie, 4 Edition, Volume 19, Verlag Chemie, Weinheim pp. 31-38).
• Suitable starter molecules are, for example, saturated monoalcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, the isomers pentanols, hexanols, octanols and nonanols, n-decanol, n-dodecanol, n-tetradecanol, n Hexadecanol, n-octadecanol, cyclohexanol, the isomeric methylcyclohexanols or hydroxymethylcyclohexane, 3-ethyl-3-hydroxymethyloxetane or tetrahydrofurfuryl alcohol, diethylene glycol monoalkyl ethers such as diethylene glycol monobutyl ether, unsaturated alcohols such as allyl alcohol, 1,1-dimethylallylalcohol
• Alkylene oxides which are suitable for the alkoxylation reaction are, in particular, ethylene oxide and propylene oxide, which can be used in any desired order or else as a mixture in the alkoxylation reaction.
• the polyalkylene oxide polyether alcohols are either pure polyethylene oxide polyethers or mixed polyalkylene oxide polyethers whose alkylene oxide units consist of at least 30 mol%, preferably at least 40 mol%, of ethylene oxide units.
• Preferred nonionic compounds are monofunctional mixed polyalkylene oxide polyethers which have at least 40 mol% of ethylene oxide and not more than 60 mol% of propylene oxide units.
• PU polymers (I) it is preferred to use a combination of ionic and nonionic hydrophilicizing agents according to the definitions of components 1.5) and 1.6). Particular preference is given to combinations of nonionic and anionic hydrophilic agents.
• the PUR polymers (D) preferably have a pure ionic hydrophilization according to the definition of the components ⁇ .5).
• the coating compositions according to the invention comprise PU polymers (T) which are used in the form of their aqueous PU dispersion (I).
• the process for the preparation of the aqueous PU dispersion (I) can be carried out in one or more stages in homogeneous or in multistage reaction, partly in disperse phase. After completely or partially carried out polyaddition from Ll) - 1.6) takes place a dispersing, emulsifying or dissolving step. This is followed, if appropriate, by a further polyaddition or modification in disperse phase.
• aqueous polyurethane dispersions (I) For the preparation of the aqueous polyurethane dispersions (I), all known from the prior art methods such as. Example, prepolymer mixing process, acetone process or Schmelzdiper- be used.
• the PU dispersion (I) is preferably prepared by the acetone process.
• the ingredients 1.2) to 1.6 which may have no primary or secondary amino groups and the polyisocyanate component Ll) for the preparation of an isocyanate-functional polyurethane prepolymer completely or partially submitted and optionally diluted with a water-miscible but isocyanate-inert solvent and heated to temperatures in the range of 50 to 120 0 C.
• the catalysts known in polyurethane chemistry can be used. Preference is given to dibutyltin dilaurate.
• Suitable solvents are the usual aliphatic, ketofunctional solvents, e.g. Acetone, butanone, which can be added not only at the beginning of the preparation, but possibly also in parts later. Preferred are acetone and butanone.
• the molar ratio of isocyanate groups to isocyanate-reactive groups is 1.0 to 3.5, preferably 1.1 to 3.0, particularly preferably 1.1 to 2.5.
• the reaction of the components 1.1) - 1.6) to the prepolymer takes place partially or completely, but preferably completely.
• polyurethane prepolymers containing free isocyanate groups are obtained in bulk or in solution.
• the partial or complete salt formation of the anionically and / or cationically dispersing groups takes place.
• bases such as tertiary amines, for example trialkylamines having from 1 to 12, preferably from 1 to 6, carbon atoms in each alkyl radical are used.
• Examples of these are trimethylamine, triethylamine, methyldiethylamine, tripropylamine and diisopropylethylamine.
• the alkyl radicals can also carry hydroxyl groups, for example, as in the dialkylmonoalkanol, alkyldialkanol and trialkanolamines.
• inorganic bases such as ammonia or sodium or potassium hydroxide may also be used as neutralizing agents. Preference is given to triethylamine, triethanolamine, dimethylethanolamine or diisopropylethylamine.
• the molar amount of the bases is between 50 and 100%, preferably between 70 and 100% of the molar amount of the anionic groups.
• cationic groups dimethyl sulphate or succinic acid are used. If only nonionically hydrophilicized compounds 1.6) with ether groups are used, the neutralization step is omitted. The neutralization can also take place simultaneously with the dispersion in which the dispersing water already contains the neutralizing agent.
• This chain extension / termination can be carried out either in a solvent before dispersion, during dispersion or in water after dispersion.
• the chain extension is preferably carried out in water before dispersion.
• the chain extension of the prepolymers preferably takes place before the dispersion.
• the degree of chain extension ie the equivalent ratio of NGO-reactive groups of the compounds used for chain extension to free NCO groups of the prepolymer, is between 40 and 150%, preferably between 70 and 120%, particularly preferably between 80 and 120%.
• the aminic components [1.3), 1.4), 1.5)] can optionally be used individually or in mixtures in water- or solvent-diluted form in the process according to the invention, wherein basically any order of addition is possible.
• the diluent content is preferably 70 to 95% by weight.
• the preparation of the PU dispersion (T) from the prepolymers takes place after the chain extension.
• the dissolved and chain extended polyurethane polymer is optionally sheared under high shear, e.g. vigorous stirring, either added to the dispersing water or, conversely, the dispersing water is stirred into the prepolymer solutions.
• the water is added to the dissolved prepolymer.
• the solvent still present in the dispersions after the dispersion step is then usually removed by distillation. A removal already during the dispersion is also possible.
• the dispersion can be adjusted very finely divided, so that it has practically the appearance of a solution, but also very coarse-particle settings are possible, which are also sufficiently stable.
• the solids content of the PU dispersion (!) is between 25 to 65%, preferably 30 to 60% and particularly preferably between 40 to 60%.
• aqueous PU dispersions (I) by polyacrylates.
• polyacrylates for this purpose, in these polyurethane dispersions, an emulsion polymerization of olefinically unsaturated monomers, e.g. Esters of (meth) acrylic acid and alcohols having 1 to 18 carbon atoms, styrene, vinyl esters or butadiene performed.
• the coating compositions of the invention comprise PU polymers (H), which are either converted into the aqueous form during production and thus present as a dispersion or alternatively also present in a water-miscible and isocyanate-inert solvent as solution.
• the crosslinkable polyurethane polymers (H) can be prepared by the usual methods known in the art. They contain carboxylic acid and / or sulfonic acid groups, preferably carboxylic acid groups, which may be at least partially neutralized, as hydrophilic groups.
• the preparation of the crosslinkable polyurethane polymers (III) is usually carried out to such an extent that first an isocyanate-functional prepolymer from compounds corresponding to the definition of components ILI) - TL.6) is prepared and in a second reaction step by reaction with compounds corresponding to the definition of the components ⁇ .3), ⁇ .4) and H5), in non-aqueous medium an OH- and / or NH-functional polyurethane is obtained, such as in EP-A 0 355 682, p. 4, Z. 39-45.
• the preparation can also be carried out such that the OH and / or NH groups-containing polyurethane resin is formed directly by reacting the components ILI) to IL 6) in non-aqueous medium, such. in EP-A 0427 028, S.4, Z. 54 - page 5, Z.l described.
• the compounds used to form this prepolymer according to the definition of component II.2) may, but not necessarily, be subjected beforehand to a distillation step under reduced pressure.
• these compounds are preferably continuously in a thin film evaporator at temperatures> 150 0 C, preferably 170 to 230 0 C, particularly preferably 180 to 220 0 C, under a reduced pressure of ⁇ 10 mbar, preferably ⁇ 2 mbar, more preferably ⁇ Distilled 0.5 mbar.
• Low molecular weight, non-reactive volatiles are separated under these conditions.
• the prepolymer preparation is usually carried out at temperatures of 0 ° to 14O 0 C, depending on the reactivity of the isocyanate used.
• Components II.1) and II.2) are preferably used in such a way that an NCO / OH ratio of 0.5 to 0.99 / 1, preferably 0.55 to 0.95 / 1 and particularly preferably 0 , 57 to 0.9 / 1 results.
• Suitable catalysts as are known to the person skilled in the art for accelerating the NCO / OH reaction.
• tertiary amines such as triethylamine or diazobicyclooctane
• organotin compounds such as dibutyltin oxide, dibutyltin dilaurate or tin bis (2-ethylhexanoate) or other organometallic compounds.
• the prepolymer preparation is preferably carried out in the presence of isocyanate-inert solvents.
• solvents are considered which are compatible with water, such as ethers, ketones and esters and N-methylpyrrolidone.
• the amount of this solvent expediently does not exceed 30% by weight and is preferably in the range from 10 to 25% by weight, in each case based on the sum of polyurethane resin and solvent.
• the acid groups incorporated in the prepolymer thus obtainable are at least partly neutralized. This can be done during or after the prepolymer but also during or after the dispersion in water by adding suitable neutralizing agent (see also in PU dispersion (I)).
• suitable neutralizing agent see also in PU dispersion (I)
• dimethylethanolamine which preferably serves as a neutralizing agent.
• the neutralizing agent is usually used in molar ratio to the acid groups of the prepolymer of 0.3: 1 to 1.3: 1, preferably from 0.4: 1 to 1: 1.
• the neutralization step is preferably carried out subsequent to the preparation of the prepolymer, wherein in principle at temperatures of 0 to 80 0 C, preferably 40 to 8O 0 C is used.
• the hydroxy- and / or amino-functional polyurethane is converted by the addition of water or by adding in water in an aqueous dispersion.
• the resins of the polyurethane polymers (H) obtainable by the procedure described above have a number-average molecular weight M n of from 1,000 to 30,000, preferably from 1,500 to 10,000, an acid number of from 10 to 80, preferably from 15 to 40 mg, KOH / g and an OH content of 0.5 to 6 wt .-%, preferably from 1.0 to 4 wt .-%.
• the PU dispersions (I) and (II) may contain as component I.7) /I1.7) antioxidants and / or light stabilizers and / or other auxiliaries and additives.
• Preferred stabilizers are sterically hindered phenols (phenolic antioxidants) and / or hindered amines based on 2,2,6,6-tetramethylene piperidine (Hindered Amine Light Stabilizers, HALS light stabilizers).
• PUR dispersants auxiliaries and additives, such as emulsifiers, defoamers, thickeners may be included in the PU dispersions.
• auxiliaries and additives such as emulsifiers, defoamers, thickeners may be included in the PU dispersions.
• fillers, Plasticizers, pigments, carbon black and silica sols, aluminum, clay, asbestos dispersions are incorporated into the PU dispersions.
• Crosslinkers TK are also present in the coating compositions according to the invention.
• both one-component and two-component coatings can be prepared.
• one-component paints are to be understood as coating agents in which binder component and crosslinker component can be stored together, without a crosslinking reaction taking place in appreciable or detrimental extent for the subsequent application.
• the crosslinking reaction takes place only after application after activation of the crosslinker. This activation may e.g. caused by increasing the temperature.
• two-component coatings are to be understood as meaning coating compositions in which the binder component and crosslinking component must be stored in separate vessels because of their high reactivity. The two components are mixed just before application and then generally react without additional activation. In order to accelerate the crosslinking reaction, it is also possible to use catalysts or to use higher temperatures.
• Suitable crosslinkers IH are, for example, blocked or unblocked polyisocyanate crosslinkers, amide and amine-formaldehyde resins, phenolic resins, aldehyde and ketone resins, such as e.g. Phenol-formaldehyde resins, resoles, furan resins, urea resins, carbamic acid ester resins, triazine resins, melamine resins, benzoguanamine resins, cyanamide resins, aniline resins, as described in "Lackbuchharze", H. Wagner, H.F. Sarx, Carl Hanser Verlag Kunststoff, 1971. Preference is given to polyisocyanates.
• Suitable crosslinkers JS) are, for example, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane, hexamethylene diisocyanate, 1,4-diisocyanatocyclohexane or bis (4-isocyanatocyclohexane) -methane or l, 3- (bis-2 isocyanatopropyl-2) benzene or polyisocyanates of hexamethylene diisocyanate, isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane or bisphenol polyisocyanates based on lacquer polyisocyanates, such as uretdione, biuret, isocyanurate or iminooxadiazined
• a two-component lacquer comprising the inventive Beschichrungsmittel.
• the said compounds containing free isocyanate groups can be converted by reaction with so-called blocking agents into less reactive derivatives, which then react only after activation, for example at higher temperatures.
• Suitable blocking agents for these polyisocyanates are, for example, monohydric alcohols such as methanol, ethanol, butanol, hexanol, cyclohexanol, benzyl alcohol, oximes such as acetoxime, methyl ethyl ketoxime, cyclohexanone oxime, lactams such as ⁇ -caprolactam, phenols, amines such as diisopropylamine or dibutylamine, Dimethylpyrazole or triazole and dimethyl malonate, diethyl malonate or dibutyl malonate.
• polyisocyanates of the abovementioned type with free isocyanate groups based on aliphatic, cycloaliphatic, araliphatic and / or aromatic isocyanates, preferably aliphatic or cycloaliphatic isocyanates, since this results in a particularly high level of resistance of the paint film leaves.
• These polyisocyanates generally have a viscosity of from 10 to 3,500 mPas at 23 ° C.
• polyisocyanates may be used in admixture with small amounts of inert solvents to lower the viscosity to a value within the stated range.
• Triisocyanatononan can be used alone or in mixtures in component JS).
• PUR polymers I) and II) described here are generally sufficiently hydrophilic, so that the dispersibility of hydrophobic crosslinkers from component HI) is ensured. If desired, however, it is also possible to add additional external emulsifiers as are known to the person skilled in the art.
• water-soluble or dispersible polyisocyanates as described, for example, in US Pat. by modi ⁇ fication with carboxylate, sulfonate and / or polyethylene oxide groups and / or polyethylene oxide / polypropylene oxide groups are available in component JS) can be used.
• Further film-forming resins of component IV) are water-dispersible, emulsifiable or soluble polymers which differ from the constituents of components I) to HCT). Examples of these are, if appropriate, polyesters containing epoxide groups, polyols urethanes, acrylic polymers, vinyl polymers such as polyvinyl acetate, polyurethane dispersions, polyacrylate dispersions, polyurethane-polyacrylate hybrid dispersions, polyvinyl ether or polyvinyl ester dispersions, polystyrene or polyacrylonitrile dispersions.
• the solids content of the film-forming resins of component IV) is preferably 10 to 100 wt .-%, particularly preferably 30 to 100 wt .-%.
• a process for preparing the aqueous coating compositions according to the invention characterized in that the PU polymers (I) and the PU polymers (II) are dispersed in water and crosslinked with the crosslinker (DI) and optionally with the fibriform resins W) are mixed.
• the PUR polymers (II) it is likewise possible for the PUR polymers (II) to be present as a solution in a water-miscible solvent which is inert toward isocyanate groups and converted into the aqueous phase by introduction into the PUR dispersion (I) and subsequently crosslinked with the crosslinker (III). and optionally with the film-forming resins PV).
• the ratio of the crosslinker IH) to the reactive with him compounds of the components H) and optionally PV) is to be chosen so that a ratio of relative to the crosslinker reactive groups of H) and W) (eg OH groups) to the reactive groups of the crosslinker (in the case of isocyanate NCO groups) of 0.5: 1.0 to 3.5: 1.0, preferably 1.0: 1.0 to 3.0: 1.0 and particularly preferably of 1.0: 1.0 to 2.5: 1.0 results.
• the mixture of components I), II) and W) preferably contains 5 to 95 wt .-%, particularly preferably 25 to 75 wt .-% of component II), wherein the amounts of I) and W) are to be chosen so the total amounts of I), H) and W) add up to 100% by weight.
• the substances known to the person skilled in the art such as defoaming agents, thickeners, pigments, dispersing agents, matting agents, catalysts, anti-skinning agents, anti-settling agents and / or emulsifiers, as well as additives which enhance the desired soft feel effect, can be present in the coating compositions according to the invention , It is irrelevant at what point in the production of these added to the coating compositions of the invention or incorporated into this.
• aqueous coating compositions according to the invention are suitable for all fields of use in which aqueous coating and coating systems with high surface finish requirements of the films are used, eg coating of mineral building material surfaces, painting and sealing of wood and wood-based materials, coating of metallic surfaces (metal coating ), Coating and painting asphalt or bituminous coatings, varnishing and sealing of various plastic surfaces (plastic coating) as well as high gloss varnishes.
• a preferred use of the coating compositions according to the invention is the production of soft feel effect paints, which ensure good hydrolysis resistances with very good haptic properties.
• Such coating agents are preferably lacquered in the plastics or the used timber coating, the curing is usually carried out at temperatures between room temperature and 130 0 C.
• the two-component technology with non-blocked polyisocyanates as crosslinkers allows the use of comparatively low curing temperatures in the above-mentioned interval.
• Softfeel paints containing the coating compositions according to the invention are thus also the subject of the present invention.
• aqueous coating compositions of the invention are usually used in single-coat paints or in the clearcoat or topcoat (top coat) of multi-layered structures.
• the coating can be produced by the various injection methods, such as, for example, air-pressure, airless or electrostatic spray methods, using one-component or optionally two-component spray systems.
• the lacquers and coating compositions containing the binder dispersions according to the invention can also be applied by other methods, for example by brushing, rolling or knife coating.
• the present invention likewise relates to a multi-layer structure, characterized in that the uppermost layer, which is a clear or topcoat layer, contains a soft feel coating containing the coating compositions according to the invention.
• Diaminosulphonate NH 2 -CH 2 CH 2 -NH-CH 2 CH 2 -SO 3 Na (45% in water)
• Bayhydrol ® XP 2429 Aliphatic, hydroxyfunctional polyester polyurethane dispersion with a solids content of 55% (Bayer AG, Leverkusen, Germany)
• Bayhydrol ® XP 2441 Aliphatic hydroxyfunctional polyester polyurethane resin, 75% in
• Desmophen ® 2020 polycarbonate polyol, OH number 56 mg KOH / g, number-average molecular weight 2000 g / mol (Bayer AG, Leverkusen, DE)
• PolyTHF ® 2000 Polytetramethylenglykolpolyol, OH number 56 mg KOH / g, number average molecular weight 2000 g / mol (BASF AG, Ludwigshafen, DE)
• PolyTHF ® 1000 Polytetramethylenglykolpolyol, OH number 112 mg KOH / g, nado ⁇ average number average molecular weight 1000 g / mol (BASF AG, Ludwigshafen, DE)
• Polyether LB 25 (monofunctional polyether based on ethylene oxide / propylene oxide number-average molecular weight 2250 g / mol, OH number 25 mg KOH / g (Bayer AG, Leverkusen, DE)
• BYK 348 Wetting agent (BYK-Chemie, Wesel, DE)
• Tego-Wet ® KL 245 Leveling additive, 50% in water (Tegochemie, Essen, DE)
• Aquacer ® 535 wax emulsion (BYK-Chemie, Wesel, DE)
• Defoamer DNE Defoamer (K. Obermayer, Bad Berleburg, DE)
• Sillitin ® Z 86 filler (Hoffmann & Sons, Neuburg, DE)
• Pergopak ® M 3 filler, matting agent (Martinstechnik, Bergheim, DE)
• Bayferrox ® 318 M Color pigment (black) (Bayer AG, Leverkusen, DE)
• OK 412 matting agents (Degussa, Frankfurt, DE)
• Bayhydur ® 3100 Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) having an isocyanate content of 17.4% (Bayer AG, Leverkusen, DE)
• Bayhydur ® VPLS 2306 Hydrophil modified, aliphatic polyisocyanate based on
• Hexamethylene diisocyanate (HDI) with an isocyanate content of 8.0% (Bayer AG, Leverkusen, DE)
• Desmodur ® XP 2410 Low viscosity, aliphatic polyisocyanate resin based Hexa ⁇ diisocyanate having an isocyanate content of 24.0% (Bayer AG, Leverkusen, Germany)
• the solids contents were determined according to DESf-EN ISO 3251.
• NCO contents were determined volumetrically in accordance with DIN-EN ISO 11909, unless expressly stated otherwise.
• Bayhydrol ® PR 240 anionically hydrophilized PUR dispersion based on polyester
• Solids content of 40% and an average particle size of 100-300 nm (Bayer AG, Leverkusen, DE)
• the finished prepolymer is dissolved with 1040 g of acetone at 50 0 C and then added a solution of 1.8 g of hydrazine hydrate, 9.18 g of diaminosulfonate and 41.9 g of water within 10 min.
• the stirring time is 10 min.
• After adding a solution of 21.3 g of isophorone diamine and 106.8 g of water is dispersed within 10 min by adding 395 g of water. This is followed by removal of the solvent by distillation in vacuo and a storage-stable dispersion having a solids content of 50.0% is obtained.
• the following performance engineering experiments for the production of softfeel coatings are carried out using Examples 1-2.
• the parent lacquer is prepared by predispersion by trituration over a laboratory shaker. The temperature of the ground material should not exceed 40 ° C. Then stir in O 412 for approx. 10 min. After crosslinking, the paint system is set to a flow time of approx. 30 s (DIN ISO 2431, 5 mm nozzle) and conventionally sprayed onto Bayblend ® T 65. The dry film thickness is between 30 and 40 ⁇ m.
• the pencil hardening method is a test for determining the paint film hardness. Pencils of different hardness (6B to 7H) on painted specimens are tested at room temperature as follows: The pencil tip is ground horizontally to give a flat, round surface. At an angle of 45 °, the pencil is then pushed over the paint film to be tested, whereby a force that is as constant as possible should be applied. The value of pencil hardness is determined when the paint surface is damaged for the first time.
• the film softening is determined by means of the film nail sample. The assessment of the

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• 2004
  • 2004-09-20 DE DE102004045533A patent/DE102004045533A1/de not_active Withdrawn
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